WO2012148192A2 - Procédé pour la fourniture d'informations de contrôle de la puissance en liaison montante d'une station de base et procédé de contrôle de la puissance en liaison montante d'un équipement d'utilisateur, station de base associée et équipement d'utilisateur associé - Google Patents

Procédé pour la fourniture d'informations de contrôle de la puissance en liaison montante d'une station de base et procédé de contrôle de la puissance en liaison montante d'un équipement d'utilisateur, station de base associée et équipement d'utilisateur associé Download PDF

Info

Publication number
WO2012148192A2
WO2012148192A2 PCT/KR2012/003243 KR2012003243W WO2012148192A2 WO 2012148192 A2 WO2012148192 A2 WO 2012148192A2 KR 2012003243 W KR2012003243 W KR 2012003243W WO 2012148192 A2 WO2012148192 A2 WO 2012148192A2
Authority
WO
WIPO (PCT)
Prior art keywords
terminal
power
information
transmission
csi
Prior art date
Application number
PCT/KR2012/003243
Other languages
English (en)
Korean (ko)
Other versions
WO2012148192A3 (fr
Inventor
박경민
Original Assignee
(주)팬택
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by (주)팬택 filed Critical (주)팬택
Publication of WO2012148192A2 publication Critical patent/WO2012148192A2/fr
Publication of WO2012148192A3 publication Critical patent/WO2012148192A3/fr
Priority to CN201380075548.6A priority Critical patent/CN105189808B/zh

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/143—Downlink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/247—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where the output power of a terminal is based on a path parameter sent by another terminal

Definitions

  • the present invention relates to a wireless communication system, and relates to uplink power control in a wireless communication system.
  • each terminal controls power of a physical channel and a signal such that different uplink physical channels and signals are received at a base station (cell) at an appropriate power.
  • This uplink power control directly controls the transmit power of the terminal through an open loop scheme in which the transmit power of the terminal varies according to the downlink path loss and an explicit power control command in which the network is transmitted in downlink. There is a closed loop method.
  • An object of the present invention is to provide an uplink power control method suitable for a heterogeneous network and a method for transmitting information necessary for uplink power control to a terminal.
  • an embodiment of the present invention provides a method of providing information of a base station for uplink power control of a terminal, and includes: a first transmission for transmitting a common reference signal or a cell-specific reference signal (CRS) to a terminal; Searching for at least one second transmitting end capable of transmitting a Channel Status Information Reference Signal (CSI-RS) to the terminal and the terminal; And transmitting information of the transmission power of the CRS transmitted from the first transmission terminal and information of the transmission power of the CSI-RS transmitted from the second transmission terminal to the terminal.
  • CRS Cell-specific reference signal
  • Another embodiment of the present invention is a method for controlling uplink power of a terminal, comprising: information on transmission power of a CRS (Common Reference Signal or Cell-Specific Reference Signal) transmitted from a first transmitter, and from one or more second transmitters Receiving information on transmission power of a transmitted CSI-RS (Channel Status Information Reference Signal); The transmission power information of the CRS transmitted from the first transmitting end and the measured reception power of the CRS is compared, or the transmission power information of the CSI-RS transmitted from the second transmission end and the measured reception power of the CSI-RS are compared. Calculating a path loss; And controlling uplink power by using path loss.
  • CRS Common Reference Signal or Cell-Specific Reference Signal
  • a first transmission terminal for transmitting a common reference signal or a cell-specific reference signal (CRS) to the terminal and one or more capable of transmitting a channel status information reference signal (CSI-RS) to the terminal
  • a transmitter searching unit searching for a second transmitter
  • an information transmitter which transmits information on the transmission power of the CRS transmitted from the first transmission terminal and information on the transmission power of the CSI-RS transmitted from the second transmission terminal to the terminal.
  • Another embodiment of the present invention provides information on transmission power of a CRS (Common Reference Signal or Cell-Specific Reference Signal) transmitted from a first transmitting end, and CSI-RS (Channel Status) transmitted from one or more second transmitting ends.
  • An information storage unit for receiving information of transmission power of an information reference signal; a power measurement unit for measuring reception power of a CRS transmitted from the first transmission terminal and a CSI-RS from the second transmission terminal; Comparing the information on the transmission power of the CRS transmitted from the first transmission terminal and the received power of the measured CRS, or the information on the transmission power of the CSI-RS transmitted from the second transmission terminal and the received power of the measured CSI-RS
  • a path loss calculator configured to compare paths and calculate path loss; And an uplink transmitter for controlling uplink power using the path loss.
  • FIG. 1 is a diagram illustrating an example of a communication system to which embodiments of the present invention can be applied;
  • FIG. 2 is a diagram illustrating an area in which a signal transmitted from a terminal arrives at a controlled uplink transmission power based on a base station when the RRH is closer to the base station.
  • FIG. 3 is a flowchart of a method for controlling uplink power according to a first embodiment
  • FIG. 4 is a diagram illustrating a configuration of a system and a pattern of a CSI-RS when a terminal receives a CSI-RS from a base station and an RRH;
  • FIG. 5 is a block diagram illustrating a configuration of a transmitting end transmitting a PDSCH
  • FIG. 6 is a block diagram illustrating a process of processing a physical channel at a transmitting end
  • FIG. 7 is a block diagram illustrating a process of processing a DM-RS in an RRH
  • FIG. 8 is a flowchart of an uplink power control method according to a second embodiment
  • FIG. 9 is a diagram illustrating frequency resources allocated in one RRH
  • FIG. 10 is a block diagram illustrating a configuration of a base station according to the third embodiment of the present invention.
  • FIG. 11 is a block diagram illustrating a configuration of a terminal according to the fourth embodiment of the present invention.
  • the wireless communication system is to provide various communication services such as voice and packet data, and generally includes a user equipment (UE) and a transmission point.
  • UE user equipment
  • a terminal or a user equipment is a comprehensive concept meaning a user terminal in wireless communication.
  • a UE in WCDMA, LTE, and HSPA, as well as a mobile station (MS) and a user terminal (UT) in GSM, It should be interpreted as a concept that includes a subscriber station (SS), a wireless device, and the like.
  • MS mobile station
  • UT user terminal
  • a transmission point all devices communicating with the UE in the sense of transmitting information to the UE may be referred to as a “transmission point”, and in addition to the base station or the cell, such a transmission end may be referred to as RRH (Radio) connected to the base station.
  • RRH Radio
  • Comprehensive means any type of device that can communicate with a single terminal, such as a remote head, a relay node, a sector of a macro cell, a site, or a micro cell such as another femtocell or picocell. It is used as a concept.
  • a base station or a cell generally refers to all devices or functions or specific areas for communicating with a terminal, and includes a Node-B, an evolved Node-B, an Sector, and a Site. It may be called by other terms such as a base transceiver system (BTS), an access point, an access point, and a relay node.
  • BTS base transceiver system
  • the base station or cell has a unique cell ID.
  • a repeater such as an RRH connected to a base station by wire and a relay node wirelessly connected to a base station may be used to expand coverage of a base station and to eliminate a shadow area.
  • the terminal may communicate with a transmission terminal such as an RRH, a relay node, etc. adjacent to the terminal in addition to the base station.
  • a communication system in which each cell (base station) or transmission end is independently configured while having the same or similar level of coverage area may be referred to as a homogeneous network. It may be defined as a heterogeneous network.
  • the homogeneous network and the heterogeneous network will be described in more detail as follows.
  • a cellular system utilizes radio resources that are limited in a manner in which multiple cells use the same frequency band or different frequency bands.
  • a signal transmitted by a base station does not propagate for a predetermined distance, and an area in which a signal propagated by each base station can be called a cell area or a cell coverage area.
  • each cell region is configured independently except for portions overlapping each other. Therefore, even when the same radio resource is used in each cell region, it is possible to perform wireless communication without inter-cell interference.
  • each terminal in the case of a communication network composed of a plurality of cells or transmission terminals in which some or all of the coverage areas overlap, it is possible for each terminal to simultaneously receive or transmit signals and information from two or more transmission terminals.
  • the transmitting end is a comprehensive concept including a base station, eNB, RRH, relay node, and the like.
  • homogeneous through a scheduling scheme that designates a transmission terminal to communicate with each terminal and a band to be used by each terminal according to the distribution state of the terminal connected to the heterogeneous network and the channel state of each terminal. It can provide better communication quality than homogeneous network.
  • terminals located in the area are relatively uplink and downlink. Since the communication environment is configured to have a high reception power, it is possible to receive a high-speed information transmission service, which increases the overall communication efficiency of the communication network.
  • a cooperative multiple or cooperative type in which a terminal receives information from two or more transmitting terminals at the same time or transmits information to the same terminal through cooperative communication while two or more transmitting terminals are controlled by the same scheduler.
  • 'CoMP Systems' Coordinated Multi-Point Tx / Rx Communication Systems
  • each UE communicates in one environment with one base station, one RRH, as well as two or more RRHs, or simultaneously transmits and receives signals and information with the base station and the RRH.
  • a higher scheduling gain can be obtained by performing scheduling to change the number of transmitting terminals (base stations or RRHs) and the number of transmitting terminals to be appropriately adapted to channel conditions and network conditions.
  • the reference signal is a signal predefined in the transmitter and the terminal for two purposes.
  • the first purpose is to measure Channel Status Information (CSI) for the transmitting end in the terminal.
  • the terminal measures the CSI through the reference signal and reports it to the transmitter.
  • the second purpose is to estimate the channel response for demodulation of the signal received at the terminal. For example, when the transmitting end transmits a complex signal, it should be possible to estimate how the transmission signal is distorted on the channel for coherent demodulation.
  • the terminal may estimate the channel response through a predefined reference signal.
  • CRS cell-specific reference signal
  • a cell-specific reference signal which is a reference signal for identifying channel information in downlink
  • CRS is transmitted every subframe.
  • CRS is commonly used by all terminals in a cell.
  • CRS is defined for up to four antennas.
  • the channel state information reference signal (CSI-RS) for estimating the channel state information is 12 corresponding to one resource block (RB) on the frequency axis at regular intervals on the time axis.
  • One RE Resource Element
  • Next-generation communication technology can support up to eight antennas for downlink, and up to eight CSI-RSs are also allocated.
  • a UE-Specific Reference Signal which is a reference for demodulating a physical channel, for example, a physical downlink shared channel (PDSCH), is used only when PDSCH transmission is associated with an antenna port. It exists as a reference for PDSCH demodulation.
  • the DM-RS is transmitted only to the resource block to which the corresponding PDSCH is mapped.
  • FIG. 1 shows an example of a communication system to which embodiments of the present invention can be applied.
  • the communication system is configured such that the terminal 10 can communicate with a plurality of transmission terminals 20 and 30.
  • the plurality of transmission terminals 20 and 30 may include a wide transmission terminal 20 having one wide coverage area and one or more cooperative transmission terminals 30 having a narrow coverage area included in the coverage area of the wide transmission terminal 20. ).
  • the wide area transmitter 20 may be an eNB of a macro cell, and the cooperative transmitter 30 may be RRH, but is not limited thereto.
  • the wide area transmitter 20 may be the same as a base station or a transmitter having the same cell coverage. It is a comprehensive concept including all transmitters having cell identifiers and capable of simultaneously transmitting and receiving information to the same terminal.
  • the base station as the wide area transmission terminal 20 and the RRH as the cooperative transmission terminal 30 will be described as an example.
  • a network may be configured such that a base station 20 and one or more RRHs 30 have a cell ID of the same identifier to switch a transmitting end for downlink without a handover process.
  • 20 and one or more RRHs 30 may have downlink communication with each terminal while having the same cell ID.
  • each terminal 10 may perform uplink communication alone with the base station 20 and the RRH 30 or simultaneously with the base station 20 and the RRH 30.
  • the base station 20 and / or the RRH 30 transmits at least one of control signals and data through a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH).
  • Channels corresponding to the PDCCH and PDSCH may include a physical uplink control channel (PUCCH) and a physical uplink shared channel (PUSCH), respectively.
  • the terminal transmits at least one of a control signal and data through at least one of the PUCCH and the PUSCH.
  • a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, and a PDSCH will be described in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, and a PDSCH.
  • the CRS which is a reference signal commonly used in all terminals in a cell, may be transmitted from one transmitter in the cell and may be transmitted from the base station 20 having wide coverage.
  • the base station 20 and / or the RRH 30 may use the distinguishable resources to transmit the CSI ⁇ to the terminal 10.
  • RS can be transmitted.
  • the specific terminal 10 may receive the DM-RS transmitted by the base station 20 and / or the RRH 30 to demodulate the PDSCH.
  • the DM-RS is a UE specific reference signal.
  • the base station 20 transmits the CRS, and in order for the terminal 10 to receive traffic data from the base station 20, the base station 20 transmits the CSI-RS and the DM-RS together with the CRS to the terminal 10.
  • Can transmit In order for the terminal 10 to receive traffic data from the RRH 30, the RRH 30 may transmit the CSI-RS and the DM-RS to the terminal 10.
  • a transmitting end for transmitting the CRS to the terminal 10 is called a first transmitting end
  • a transmitting end for transmitting a signal to the terminal 10 through a PDSCH is called a second transmitting end.
  • the base station 20 has been described as transmitting the CRS, the present invention is not limited thereto, and one transmitting end transmitting the CRS will be the first transmitting end.
  • a situation in which a plurality of transmitters simultaneously transmit CRS may be considered. However, in this case, multiple transmitters must transmit CRS using the same antenna port. That is, when one transmitting end transmits the CRS, the other transmitting end may assist in receiving the CRS by transmitting the same CRS.
  • the terminal 10 performs uplink signal transmission to the transmitters 20 and 30. Since the plurality of transmission terminals 20 and 30 all have the same cell ID, the terminal 10 does not transmit one uplink signal by specifying one of the plurality of transmission terminals 20 and 30. That is, the signal transmission through the PUCCH and the PUSCH and the hybrid automatic repeat request (HARQ) ACK / NACK signal are not transmitted by specifying one of the plurality of transmission terminals 20 and 30.
  • HARQ hybrid automatic repeat request
  • the transmit power of the PUCCH (P PUCCH (i)) in the subframe (i) ) May be determined by Equation 1 below.
  • P CMAX, c (i) is the maximum transmit power of the terminal 10 in the subframe (i) with respect to the serving cell (c), PUCCH transmit power is limited by the maximum transmit power of the terminal 10 do.
  • P 0_PUCCH is a factor for the received power that should be guaranteed in transmitting the PUCCH.
  • P 0_PUCCH is a factor for the reception power required to obtain the reception signal-to-interference and noise ratio (SINR) required by the transmitter, and is determined by the PUCCH format.
  • SINR reception signal-to-interference and noise ratio
  • h (n CQI , n HARQ, n SR ) is n CQI corresponding to the number of information bits for Channel Quality Information ( CQI ), n HARQ , the number of HARQ bits transmitted in subframe (i), and subframe (i ) Is a power offset by n SR indicating whether a scheduling request (SR) is configured for the UE.
  • CQI Channel Quality Information
  • n HARQ the number of HARQ bits transmitted in subframe (i)
  • subframe (i ) Is a power offset by n SR indicating whether a scheduling request (SR) is configured for the UE.
  • ⁇ F_PUCCH (F) is an offset determined by the PUCCH format (F).
  • ⁇ TxD (F ′) is an offset considering the case where the terminal 10 is configured to transmit PUCCH in two antenna ports.
  • g (i) is a value for directly adjusting the PUCCH transmit power through an explicit power control command.
  • g (i) is cumulative and increases or decreases by a certain amount.
  • g (i) may be included in the downlink scheduling assignment or may be provided on a special PDCCH which simultaneously provides power control commands to multiple terminals (DCI format 3 / 3A).
  • g (i) may be used to compensate for uplink multipath fading not reflected in downlink path loss, and to compensate for a change in uplink interference not reflected in P 0_PUCCH .
  • the transmit power of the PUSCH (P PUSCH, c (i)) in the subframe (i) is Can be determined by Equation 2.
  • the transmit power P PUSCH, c (i) of the PUSCH in the subframe i may be determined by Equation 3 below.
  • P CMAX, c (i) is the maximum transmit power of the terminal 10 in the subframe (i) for the serving cell (c), Is the linear value of P CMAX, c (i). Is a linear value of P PUCCH (i) defined in equation (1).
  • the PUSCH transmission power is limited by the maximum transmission power of the terminal 10.
  • the PUSCH transmission power is limited by a limit value of the transmission power of the PUCCH at the maximum transmission power of the terminal 10.
  • M PUSCH, c (i) is the bandwidth of the PUSCH resource allocation expressed as the number of valid resource blocks for the serving cell (c) and subframe (i). Allocation of more resource blocks requires higher transmit power.
  • P 0_PUSCH, c (j) is a factor for the received power that should be guaranteed in transmitting the PUSCH.
  • P 0_PUSCH is a factor for the received power required to obtain the received SINR required by the transmitter, and is determined by the PUSCH format and the like.
  • P 0_PUSCH is a value determined based on the interference level at the transmitting end, and the interference may vary depending on the system construction situation, and may vary depending on time since the load in the network changes over time.
  • J 0 for PUSCH (re) transmission for semi-persistent grant
  • j 1 for PUSCH (re) transmission for dynamic scheduled grant
  • random J 2 for PUSCH (re) transmission for random access response grant.
  • RSRP Reference Signal Received Power
  • ⁇ TF, c (i) is an offset determined by the Modulation and Coding Scheme (MCS) for the serving cell (c).
  • MCS Modulation and Coding Scheme
  • f c (i) is a value for directly adjusting the PUSCH transmit power through an explicit power control command.
  • f (i) is a cumulative value, increasing or decreasing by a certain amount.
  • f (i) is in UL grant.
  • Equations 1 to 3 are equations for calculating transmission power when uplink the base station 20.
  • the path loss PLc is calculated based on the CRS which is a reference signal from the base station 20.
  • Uplink power control to a transmitting end other than the base station 20 (for example, the RRH 30) cannot be calculated by Equations 1 to 3.
  • FIG. 2 is a schematic diagram showing a distance that a transmission signal reaches when the terminal 10 transmits a PUCCH and a PUSCH.
  • the terminal 10 attempts an uplink connection with at least one of the base station 20 and the RRH 30.
  • the terminal 10 attempts an uplink connection with one transmission terminal close to itself, for example, the RRH 30, the terminal 10 consumes less transmission power than when the terminal 10 is connected to the base station 20. can do.
  • the terminal 10 does not attempt to connect to the base station 20, but when each terminal attempts to connect to an adjacent transmission terminal (base station 20 or RRH 30), a spectrum reuse effect is obtained. You can get it.
  • the transmitting terminals 20 and 30 transmitting the PDSCH to the terminal 10 transmit the CSI-RS and the DM-RS as reference signals.
  • the terminal 10 knows the transmission power of the CSI-RS or DM-RS of the transmitting end 20, 30, the terminal 10 transmits the PDSCH by measuring the received power of the CSI-RS or DM-RS
  • the downlink path loss with the transmitter 20, 30 can be calculated.
  • the transmit power P PUCCH (i) of the PUCCH in the subframe i may be determined by Equation 4 below.
  • RSRP Reference Signal Received Power
  • the transmission power P PUSCH, c (i) of the PUSCH in the subframe i may be determined by Equation 5 below.
  • the transmission power P PUSCH, c (i) of the PUSCH in the subframe i is determined by Equation 6 below.
  • Equations 5 and 6 P CMAX, c (i), , , M PUSCH, c (i), P 0_PUSCH, c (j), ⁇ c (j), ⁇ TF, c (i), and f c (i) is the same as the equations (2) and (3).
  • PL tp is the path loss calculated for the particular transmit end.
  • PL tp (Reference Signal Received Power (RSRP)), and the reference signal is one or more of CRS, CSI-RS, or DM-RS.
  • RSRP Reference Signal Received Power
  • the CRS is transmitted in all resource blocks, and each resource block includes 12 subcarriers on the frequency axis and 0.5 ms slot on the time axis.
  • the CSI-RSs are transmitted at intervals of 5, 10, 20, 40, or 80 subframes, and each subframe has a size of 1 ms.
  • the DM-RS exists for PDSCH demodulation only when PDSCH transmission is related to a corresponding antenna port, and the DM-RS is transmitted only to a resource block to which a corresponding PDSCH is mapped.
  • CRS has a larger time coverage than CSI-RS and a greater frequency coverage than DM-RS. Therefore, when the transmitting end transmitting the PDSCH is the same as the transmitting end transmitting the CRS, the terminal 10 may calculate the path loss using the CRS.
  • the base station 20 searches for all transmission terminals 20 and 30 that may transmit the PDSCH to the terminal 10 (step S301).
  • the system shown in FIG. 1 may use dynamic downlink CoMP.
  • the base station 20 may designate one or more transmission stages 20 and 30 for downlinking to the terminal 10, and the transmission stages 20 and 30 for downlinking may be configured according to changes in the environment of the system. 20).
  • the base station 20 searches not only the transmitting end for transmitting the PDSCH to the terminal 10 but also all the transmitting ends capable of transmitting the PDSCH to the terminal 10, and then allocates an optimal transmitting end to the terminal.
  • allocating a transmitting end means that the terminal notifies the terminal of information necessary for receiving a signal from each transmitting end.
  • the base station 20 transmits the CSI-RS transmission power information and the CSI-RS configuration information of the searched transmission terminals 20 and 30 to the terminal 10 (step S302).
  • the CSI-RS transmission power information and the CSI-RS configuration information may be stored in a table in the terminal 10 or preset in the system so that the terminal 10 may know in advance.
  • the base station 20 transmits information on CSI-RS transmit power for eight antenna ports of the base station 20, and CSI-RS transmit power for four or less antenna ports of the RRH 30. Information about can be transmitted.
  • the base station 20 may transmit information on the number of antenna ports and the CSI-RS pattern of each of the transmission terminals 20 and 30.
  • higher layer signaling for example, RRC (Radio Resource Control) signaling such as Table 1 below (RRC signaling table for the CSI-RS pattern) may be used.
  • RRC Radio Resource Control
  • (k ', l') represents the subcarrier number and symbol number of the first RE (resource element) to which antenna 0 is allocated in the CSI-RS, and (n s mod 2) represents the slot configuring the corresponding subframe. Number (0 or 1).
  • RRC signaling may be 5 bits having a value of 0 to 31.
  • FIG. 4 (a) illustrates a case in which the terminal 10 receives the CSI-RS from the base station 20 and one RRH 30.
  • the base station 20 has four CSI-RS ports, the CSI-RS pattern is zero, and the RRH 30 has two CSI-RS ports and the CSI-RS pattern is five.
  • the CSI-RS from the base station 20 is mapped to "401" to the resource element, and the CSI-RS from the RRH 30 is mapped to "402".
  • the CRS transmission power and the CSI-RS transmission power transmitted from the base station 20 to the terminal by higher layer signaling, for example, RRC signaling, are 43 dBM and the CSI-RS transmission power transmitted from the RRH 30. Is 23 dBM.
  • the reference signal power table has the form [43, 23], the CSI-RS pattern table [0, 5], and the CSI-RS port table [4, 2].
  • the first value in the reference signal power table represents the CRS transmit power.
  • the above-described CSI-RS transmission power information and CSI-RS configuration information may be transmitted in RRC (Radio Resource Control) format as a higher layer. Alternatively, they may be transmitted in the form of system information.
  • RRC Radio Resource Control
  • the base station 20 transmits the CRS to the terminal (step S303).
  • the base station 20 transmits a PDSCH to the terminal 10
  • the base station 20 also transmits a CSI-RS.
  • the RRH 30 transmitting the PDSCH to the terminal 10 transmits the CSI-RS to the terminal 10 (step S304).
  • FIG. 5 is a block diagram illustrating a configuration of a transmission terminal 20, 30 for transmitting a PDSCH.
  • a signal transmitted through the PDSCH is precoded by the precoder 501 and then mapped and transmitted by the resource element mapper 502.
  • the CSI-RS is generated by the CSI-RS generator 503 and then mapped and transmitted by the resource element mapper 502 without being precoded.
  • Each port of the CSI-RS corresponds to an antenna port of a transmitting end.
  • the terminal 10 performs uplink transmission for the transmitting end 20, 30 for transmitting the PDSCH, and controls the uplink power based on the uplink transmission. That is, the terminal 10 calculates a path loss PL tp based on the CSI-RS and controls uplink power using the calculated path loss PL tp . However, when the transmitting end transmitting the PDSCH and the transmitting end transmitting the CRS are the same (when the base station 20 transmits the PDSCH), the terminal 10 calculates a path loss (PL tp ) based on the CRS and uplink. Control power.
  • the terminal 10 When the terminal 10 receives a plurality of PDSCHs transmitted from the plurality of transmission terminals 20 and 30, the terminal 10 loses paths for each transmission terminal 20 and 30 based on the respective CSI-RSs. Calculate (PL tp ). Uplink power is controlled using a minimum value among the calculated plurality of path losses PL tp . That is, the terminal 10 performs uplink only with respect to the nearest transmission terminal 20, 30 among the plurality of transmission terminals 20, 30 transmitting the PDSCH.
  • the terminal 10 calculates the path loss PL tp . If there are many transmission terminals 20 and 30 transmitting PDSCH, and it is determined that the amount of calculation required to calculate the plurality of path loss PL tp is greater than the reference calculation amount, the terminal 10 calculates the path loss PL tp . Find the PDSCH with the highest spectral efficiency among the plurality of PDSCHs, calculate the path loss (PL tp ) based on the CSI-RS used for demodulation of the PDSCH with the highest spectral efficiency, and calculate the calculated path loss. Uplink power may be controlled based on (PL tp ).
  • the base station 20 transmits a command (indicator) indicating that the terminal 10 to calculate the path loss based on which reference signal (CRS or CSI-RS).
  • the base station 20 may include this command in an uplink scheduling grant (UL grant) using Downlink Control Information (DCI) format 0 and transmit the same through the PDCCH.
  • UL grant uplink scheduling grant
  • DCI Downlink Control Information
  • a plurality of transmissions including the uplink from the terminal 10 to the nearest transmitting end When the terminal can receive, a command indicating whether the terminal 10 will control the uplink transmission power based on a reference signal (CRS or CSI-RS) transmitted from the base station 20 can be transmitted from the base station 20 have.
  • CRS reference signal
  • CSI-RS CSI-RS
  • the base station 20 transmits an indicator of 1 bit to the terminal 10.
  • the indicator indicates whether the terminal 10 calculates the path loss PL tp based on the CRS and controls the uplink power, or calculates the path loss PL tp based on the CSI-RS and controls the uplink power.
  • the 1-bit indicator may be included in an uplink scheduling grant (UL grant) using DCI format 0.
  • the terminal 10 calculates a path loss PL tp based on the CRS and controls uplink power. If the value of the indicator is 1, the terminal 10 calculates a path loss PL tp based on the CSI-RS used for PDSCH demodulation and controls uplink power.
  • the terminal 10 calculates a path loss PL tp based on the CRS and controls uplink power.
  • the terminal 10 controls uplink power using the minimum value of the path loss PL tp or is used for demodulation of the PDSCH having the maximum spectral efficiency.
  • the path loss PL tp is calculated and the uplink power is controlled based on the received CSI-RS.
  • the base station 20 transmits an n-bit indicator to the terminal 10.
  • the indicator indicates whether the terminal 10 calculates a path loss PL tp based on a corresponding reference signal in a reference signal power table, a CSI-RS pattern table, and a CSI-RS port table and controls uplink power.
  • the number of bits n of the indicator is such that 2 n is greater than or equal to the number of reference signals included in the table. For example, when the number of reference signals included in the table is 5, the number of bits n of the indicator may be determined to be 3 or more.
  • the reference signal power table, the CSI-RS pattern table, and the CSI-RS port table respectively store the power, the pattern, and the number of ports of the CSI-RS transmitted from the transmitting end capable of transmitting the PDSCH to the terminal.
  • the first factor in these tables can store the power, pattern, and port number of the CSI. For example, if four RRHs are likely to transmit PDSCH to the UE, each table stores in each table the power, pattern, and port number for the CRS from the base station and the CSI-RS from the RRH, in each table.
  • the number of arguments is five, and the number of bits n of the indicator is three or more.
  • the path loss PL tp is calculated and the uplink power is controlled based on the CRS.
  • the indicator indicates a factor of the table other than the first, the path loss PL tp is calculated and the uplink power is controlled based on the corresponding CSI-RS.
  • the N bit indicator may be provided on a link uplink scheduling grant (UL grant) or other PDCCH using DCI format 0.
  • the base station 20 transmits an indicator of 1 bit to the terminal 10.
  • Indicator is a switching indicator indicating whether or not to use the other reference signals other than the reference signal, which measures the current path loss (PL tp) to measure a path loss (PL tp).
  • the 1-bit indicator may be included in a link uplink scheduling grant (UL grant) using DCI format 0.
  • the terminal 10 when calculating a path loss (PL tp ) based on the CSI-RS for a specific PDSCH and controlling uplink power, if the indicator value is 0, the terminal 10 is based on the same CSI-RS. To calculate the path loss (PL tp ) and to control the uplink power, if the indicator value is 1, the terminal 10 calculates the path loss (PL tp ) based on the CSI-RS for the CRS or another PDSCH and up Control link power.
  • the terminal 10 is calculated for a plurality of reference signals other than the reference signal on which it is currently based. Control uplink power using the minimum value of the plurality of path losses (PL tp ), or calculate the path loss (PL tp ) based on the CSI-RS used for channel estimation of PDSCH with the highest spectral efficiency and uplink power. To control.
  • the UE 10 may use the same CSI-RS.
  • the path loss PL tp is calculated based on the CSI-RS for another PDSCH and the uplink power is controlled.
  • Second Embodiment DM-RS Based Uplink Power Control
  • FIG. 6 is a block diagram illustrating a process of processing a physical channel including a PDSCH at a transmitting end.
  • a symbol modulated with a complex value for a codeword to be transmitted is mapped to one or more layers in the layer mapper 601.
  • the number ⁇ of layers is less than or equal to the number P of antenna ports used for transmission of a physical channel.
  • a base station may use up to eight antenna ports, and a non-base station such as an RRH may use up to four antenna ports. Therefore, the maximum number of layers in the base station is eight and the maximum number of layers in the transmitting end, such as RRH.
  • the precoding matrix W is selected from the codebook.
  • the index indicating which precoding matrix W is used in the codebook is included in DCI formats 1B and 1D.
  • the vector y [y 1 ... Output from the precoder 602. y P ] is mapped to the resource element mapper 603 and transmitted through each antenna port.
  • DM-RS is supplied for transmission of PDSCH.
  • the DM-RS is precoded at the precoder 602 using a precoding matrix such as PDSCH.
  • a base station can have up to eight antenna ports, so up to eight layers can be used for transmission of the PDSCH. Therefore, the base station can use up to eight DM-RS ports when transmitting the PDSCH.
  • a transmitting end such as RRH has eight antenna ports.
  • the number of DM-RS ports used for PDSCH transmission through the RRH is two or less or four or less. Eight DM-RS ports may be prepared in consideration of the base station, but more than five DM-RS ports are not used in the RRH.
  • the precoder 702 performs precoding on the PDSCH and the DM-RS using the precoding matrix W having a size of P ⁇ ⁇ . .
  • P is a number of 4 or less
  • ⁇ is a number of P or less.
  • the DM-RS generation unit 701 generates eight DM-RSs (x 1 ,..., X 8 ).
  • the precoder 702 generates the P signals y 1 ,..., And P from the eight DM-RSs (x 1 ,..., X 8 ) received using the precoding matrix W '.
  • the signals y 1 ,..., Y P may be mapped to the resource element mapper 703 and transmitted through P antenna ports.
  • the precoding matrix W 'of the DM-RS used in the precoder of the RRH is not the same as the precoding matrix W of the PDSCH having a size of P ⁇ ⁇ .
  • the precoding matrix W ′ of the DM-RS according to the present embodiment has a size of P ⁇ 8, the precoding matrix W of the PDSCH and the unit matrix I are combined, and the precoding matrix of the PDSCH.
  • (W) has a size of P ⁇ ⁇ (P ⁇ 4, v ⁇ P), and the unit matrix I has a size of P ⁇ P (P ⁇ 4).
  • the precoding matrix W of the PDSCH having a size of 4 ⁇ 2 is as follows.
  • the precoding matrix W 'of the DM-RS having a size of 4x8 according to the present embodiment is as follows.
  • the precoding matrix W 'of the DM-RS having a size of 4x8 includes a precoding matrix W of a PDSCH having a size of 4x2 and a unit matrix I having a size of 4x4. In combined form.
  • the same portion of the precoding matrix W 'of the DM-RS having the size of P ⁇ 8 as the precoding matrix W of the PDSCH having the size of P ⁇ ⁇ is used for demodulation of the PDSCH, which is wireless It plays the same role as the DM-RS precoding matrix in the communication system.
  • the unit matrix I having a size of P ⁇ P in the precoding matrix W ′ of the DM-RS corresponds to the one of the lower P ports among the eight DM-RS signals to each antenna port in a one-to-one manner, and the PDSCH It is not used for decoding.
  • the conversion using the precoding matrix W ' is equivalent to adding the lower P ports of the DM-RS to the P antenna ports after converting the DM-RS using the precoding matrix W of the PDSCH at the precoder. same.
  • the converted portions of x 0 and x 1 in each signal y 0 to y 3 are used for demodulation of the PDSCH.
  • the part to which one of x 4 to x 7 is added is used to measure the path loss.
  • the precoding matrix W of the PDSCH having a size of 4 ⁇ 2 may have a size of up to 4 ⁇ 4.
  • the unit matrix I having a size of 4 ⁇ 4 is illustrated, the size of the unit matrix I may vary according to the number P of antenna ports in the RRH.
  • DM-RS (x 0 to x 3 ) used for demodulation of PDSCH among DM-RSs is precoded DM-RS, and DM-RS (x 4 to x 7 ) used for path loss is preliminary. It will be called uncoded DM-RS.
  • the pre-coded DM-RS has a different form in the signal transmitted to each terminal, which is specific to the receiving terminal, and the non-precoded DM-RS has the same form in the signal transmitted to each terminal.
  • the precoding matrix W 'of the DM-RS of the present embodiment described above is used in a transmitting end such as an RRH using four or less antennas, and is not used in a transmitting end such as a base station using eight antennas. .
  • Ports of the DM-RS are orthogonal to each other in order to receive less interference. Therefore, a terminal that receives a signal transmitted by precoding the DM-RS may extract a port of each DM-RS from each signal.
  • the upper maximum four of the ports of the DM-RS is used for demodulation of the PDSCH, and the lower maximum four of the ports of the DM-RS are used to calculate the path loss.
  • FIG. 8 illustrates a DM-RS based uplink power control method according to a second embodiment.
  • the base station 20 searches for all transmission terminals 20 and 30 that may transmit the PDSCH to the terminal 10 (step S801).
  • the system shown in FIG. 1 may use dynamic downlink CoMP.
  • the base station 20 may designate one or more transmission stages 20 and 30 for downlinking to the terminal 10, and the transmission stages 20 and 30 for downlinking may be configured according to changes in the environment of the system. 20).
  • the base station 20 searches not only the transmitting end for transmitting the PDSCH to the terminal 10 but also all the transmitting ends that may transmit the PDSCH to the terminal 10.
  • the base station 20 transmits DM-RS transmission power information of the searched transmission terminals 20 and 30 to the terminal 10 (step S802).
  • DM-RS transmission power information is stored in the terminal 10 as a table.
  • the base station 20 transmits the CRS to the terminal 10 (step S803).
  • the base station 20 transmits a PDSCH to the terminal 10
  • the base station 20 also transmits a DM-RS.
  • the RRH 30 transmitting the PDSCH to the terminal 10 transmits a DM-RS to the terminal 10 (step S804).
  • the DM-RS transmitted by the base station 20 is precoded into a matrix such as a precoding matrix W for precoding the PDSCH.
  • the DM-RS transmitted by the RRH 30 is precoded into a precoding matrix W 'in which the precoding matrix W for precoding the PDSCH and the unit matrix I are combined. .
  • the terminal 10 extracts the unprecoded DM-RS from the signal transmitted from the RRH 30 and calculates a path loss PL tp using one or more of the received CRS and the unprecoded DM-RS. (Step S805).
  • the terminal 10 applies the calculated path loss PL tp to Equations 4 to 6 to control the uplink power (step S806).
  • the DM-RS is transmitted only in the resource block to which the corresponding PDSCH is mapped.
  • the PDSCH transmitted to a specific terminal 10 is transmitted through some resources among all frequency resources. Therefore, the DM-RS specified for the terminal 10 has a low frequency coverage.
  • the equation for the uplink power control of Equations 4 to 6 is based on the assumption that the path loss for the downlink is approximately equal to the path loss for the uplink.
  • the value of the path loss has a difference. To reduce this difference, it is advantageous to calculate the path loss in the wide frequency range.
  • the path loss of the downlink calculated by using the DM-RS may have a large difference from the path loss of the uplink.
  • FIG. 9 is a diagram illustrating frequency resources allocated in one RRH 30.
  • the vertical axis is a frequency resource available to the RRH 30.
  • “901” is a band allocated to a specific terminal 10 for calculating a path loss
  • “902” and “903” are other terminals and transmission modes before 8 set to 8 or 8 and later transmission modes, respectively. It is a band allocated to another terminal set to.
  • Signals transmitted over the bands 902 and 903 allocated to other terminals include precoded DM-RSs and non-precoded DM-RSs. Since the terminal 10 does not have information (for example, a codebook index) on the precoding matrix of the precoded DM-RS specific to the other terminal, the terminal 10 is precoded specific to the other terminal. DM-RS cannot be extracted. However, since all of the pre-coded DM-RSs have the same format, the terminal 10 can extract the pre-coded DM-RSs transmitted to other terminals.
  • the terminal 10 not only extracts the DM-RS that is not precoded from the signal transmitted through the band 901 allocated thereto but also precodes the signal transmitted through the band 902 and 903 allocated to the other terminal.
  • DM-RS can be extracted.
  • the terminal 10 calculates the path loss PL tp
  • the uncoded DM-RS transmitted in the band 901 allocated to the terminal 10 is not precoded in the bands 902 and 903 allocated to the other terminal.
  • DM-RS can be used.
  • the terminal 10 calculates a path loss PL tp in a frequency band wider than the band allocated to the terminal 10, and the calculated path loss PL tp can reduce an error in power control for uplink.
  • the terminal 10 performs uplink transmission for the transmitting end 20, 30 for transmitting the PDSCH, and controls the uplink power based on the uplink transmission. That is, the terminal 10 calculates a path loss PL tp based on the uncoded DM-RS transmitted from the RRH 30 transmitting the PDSCH and uses the calculated path loss PL tp to uplink. Control power. In addition, when the transmitting end transmitting the PDSCH and the transmitting end transmitting the CRS are the same (when the base station 20 transmits the PDSCH), the terminal 10 calculates a path loss PL tp based on the CRS and performs uplink. Control power.
  • the terminal 10 may receive CRS or uncoded DM ⁇ transmitted from each of the transmission terminals 20 and 30. Based on the RS, the path loss PL tp for each transmission terminal 20, 30 is calculated. Uplink power is controlled using a minimum value among the calculated plurality of path losses PL tp . That is, the terminal 10 performs uplink only with respect to the nearest transmission terminal 20, 30 among the plurality of transmission terminals 20, 30 transmitting the PDSCH.
  • the terminal 10 before calculating the path loss PL tp .
  • the loss PL tp may be calculated and the uplink power may be controlled based on the calculated path loss PL tp .
  • the base station 20 transmits a command (indicator) indicating that the terminal 10 will calculate the path loss based on which reference signal (CRS or non-precoded DM-RS).
  • the base station 20 may include such a command in an uplink scheduling grant (UL grant) using downlink control information (DCI) format 0 and transmit the same through the PDCCH.
  • UL grant uplink scheduling grant
  • DCI downlink control information
  • the transmitting end performing the downlink to the terminal 10 and the transmitting end receiving the uplink from the terminal 10 may be different, a plurality of transmissions including the uplink from the terminal 10 to the nearest transmitting end
  • the command to inform the terminal 10 whether to control the uplink transmission power based on a reference signal (CRS or DM-RS not precoded) transmitted from the base station 20 Can be sent from
  • the base station 20 transmits an indicator of 1 bit to the terminal 10.
  • the indicator indicates whether the terminal 10 calculates the path loss PL tp based on the CRS and controls the uplink power, or calculates the path loss PL tp based on the unprecoded DM-RS and uplink. Indicates whether to control power.
  • the 1-bit indicator may be included in an uplink scheduling grant (UL grant) using DCI format 0.
  • the terminal 10 calculates a path loss PL tp based on the CRS transmitted from the base station 10 and controls uplink power. If the value of the indicator is 1, the terminal 10 calculates a path loss PL tp based on the uncoded DM-RS transmitted from the RRH 30 and controls uplink power. If the value of the indicator is 1 and there are a plurality of RRHs 30 transmitting the PDSCH, the terminal 10 controls the uplink power using the minimum value of the path loss PL tp or transmits the PDSCH having the maximum spectral efficiency. The path loss PL tp is calculated and the uplink power is controlled based on the CRS transmitted from the transmitters 20 and 30 or the uncoded DM-RS.
  • the base station 20 transmits an n-bit indicator to the terminal 10.
  • the indicator indicates whether the terminal 10 calculates a path loss PL tp based on a reference signal corresponding to a factor in the reference signal power table and controls uplink power.
  • the number of bits n of the indicator is such that 2 n is greater than or equal to the number of reference signals included in the table. For example, when the number of reference signals included in the table is 5, the number of bits n of the indicator is determined to be 3 or more.
  • Each of the reference signal power tables stores power of a DM-RS transmitted from a transmitting end capable of transmitting a PDSCH to a terminal.
  • the first factor in these tables can store the power of the CSI. For example, if four RRHs are likely to transmit a PDSCH to the UE, each table stores the power for the CRS from the base station and the DM-RS from the RRH in a reference signal power table, and factor in the reference signal power table.
  • the number of times is 5, and the number of bits n of the indicator is 3 or more.
  • the path loss PL tp is calculated and the uplink power is controlled based on the CRS.
  • the indicator indicates a factor other than the first, the path loss PL tp is calculated and the uplink power is controlled based on the corresponding uncoded DM-RS.
  • the N bit indicator may be provided on a link uplink scheduling grant (UL grant) or other PDCCH using DCI format 0.
  • the base station 20 transmits an indicator of 1 bit to the terminal 10.
  • Indicator is a switching indicator indicating whether or not to use the other reference signals other than the reference signal, which measures the current path loss (PL tp) to measure a path loss (PL tp).
  • the 1-bit indicator may be included in a link uplink scheduling grant (UL grant) using DCI format 0.
  • a path loss PL tp based on the unprecoded DM-RS transmitted from a specific RRH 30 and controlling uplink power
  • the terminal 10 calculates a path loss (PL tp ) and controls uplink power based on the same non-precoded DM-RS, and if the value of the indicator is 1, the terminal 10 is transmitted from the CRS or another RRH 30.
  • the path loss (PL tp ) is calculated and the uplink power is controlled based on the non-precoded DM-RS.
  • the terminal 10 is calculated for a plurality of reference signals other than the reference signal on which it is currently based. Based on the CRS or the unprecoded DM-RS transmitted from the transmitter 20 or 30 transmitting the PDSCH having the maximum spectral efficiency or controlling the uplink power using the minimum value of the plurality of path losses PL tp . To calculate the path loss (PL tp ) and to control the uplink power.
  • the value of the indicator is 0.
  • the terminal 10 calculates a path loss PL tp based on the same non-precoded DM-RS and controls uplink power.
  • the terminal 10 determines the current path loss PL tp .
  • the path loss (PL tp ) is calculated and the uplink power is calculated based on the CRS or other uncoded DM-RS along with the non-precoded DM-RS on which the calculation is based.
  • the base station 20 transmits an indicator of 2 or n bits to the terminal 10.
  • the indicator 10 calculates a path loss PL tp and controls uplink power based on any reference signal among the CSI, CSI-RS related to PDSCH transmission and unprecoded DM-RS related to PDSCH transmission.
  • the CSI-RS has a large frequency coverage but a small time coverage
  • the DM-RS has a large time coverage but a small frequency coverage.
  • one or more of the CSI-RS and the DM-RS are selected to calculate a path loss from a transmitter that does not transmit the CRS.
  • the path loss (PL tp ) is calculated based on the CRS. If the indicator is 1, the path loss (PL) is based on the non-precoded DM-RS. tp ), and if the value of the indicator is 2, the path loss (PL tp ) is calculated based on CSI-RS; if the value of the indicator is 3, the path loss is based on unprecoded DM-RS and CSI-RS. Can be set to calculate (PL tp ).
  • the indicator is n (n> 2) bits, and the value of the indicator calculates a path loss PL tp based on a reference signal corresponding to a few factors in the previously received reference signal power table and uplink. Indicates whether to control power.
  • the reference power table includes CRS, DM-RS, and CSI-RS transmission powers of a transmitting end capable of transmitting PDSCH to the terminal.
  • the N-bit indicator indicates the first factor
  • the path loss PL tp is calculated and the uplink power is controlled based on the CRS.
  • the indicator indicates a factor other than the first
  • the path loss PL tp is calculated and the uplink power is controlled based on the corresponding CSI-RS or non-precoded DM-RS.
  • each table stores the power for the CRS from the base station and the DM-RS and CSI-RS from the RRH in a reference signal power table, and the reference signal.
  • the number of arguments in the power table is nine, and the number of bits n of the indicator is three or more.
  • the 2 or N bit indicator may be provided on a link uplink scheduling grant (UL grant) or other PDCCH using DCI format 0.
  • FIG. 10 is a block diagram of a base station according to the third embodiment of the present invention.
  • the base station 1000 may search for a first transmitter for transmitting a CRS to a specific terminal and a transmitter search unit 1010 for searching for one or more second transmitters capable of transmitting a PDSCH, and the discovered transmitter. And an information transmitter 1020 for transmitting information on the transmission power of the transmitted reference signal to the terminal.
  • the first transmitting end transmitting the CRS may be, for example, a base station.
  • the second transmitting end capable of transmitting the PDSCH includes a base station, an RRH, and the like.
  • the transmitter search unit 1010 searches for one or more second transmitters capable of transmitting the PDSCH to the terminal in consideration of the position of the terminal, the position of the transmitter, and the transmit power of the transmitter.
  • the information transmitter 1020 transmits information on the transmission power of the CRS transmitted from the first transmitter and information on the transmission power of the reference signal transmitted from the second transmitter.
  • the reference signal transmitted from the second transmitter includes a CSI-RS and a DM-RS. Such transmit power information may be included in the RRC.
  • the information transmitter 1020 may transmit information such as the pattern of the CSI-RS, the number of ports of the CSI-RS, and the like, in addition to the transmission power information.
  • Transmission power information of the CRS, CSI-RS, and DM-RS transmitted from the information transmitter 1020 will be required when the UE calculates a path loss and controls uplink power.
  • FIG. 11 is a block diagram of a terminal according to a fourth embodiment of the present invention.
  • the terminal 1100 includes a downlink receiver 1110 for receiving a downlink signal, an information storage unit 1120 for storing power information of a reference signal among downlink signals, and a reference signal among downlink signals.
  • a path loss that calculates a path loss by comparing the power information of the reference signal stored in the power measuring unit 1130 and the information storage unit 1120 to measure the received power with the received power of the reference signal measured by the power measuring unit 1030.
  • the calculator 1140 and an uplink transmitter 1150 for controlling the uplink power of the terminal using the path loss calculated by the path loss calculator 1140.
  • the power information of the reference signal is stored in the information storage unit 1120.
  • the power information of the reference signal stored in the information storage unit 1120 may include power information of the CRS transmitted from the first transmission terminal (for example, the base station) that transmits the CRS, one or more that may transmit the PDSCH to the terminal 1100. It includes the power information of the reference signal (CSI-RS, DM-RS) transmitted from the second transmission end (for example, base station, RRH).
  • the downlink receiver 1110 may also store information about the pattern of the CSI-RS and the number of CSI-RS ports.
  • the power measurement unit 1130 measures the received power of the reference signal.
  • the path loss calculator 1140 calculates a path loss which is a difference between the reference signal power information stored in the information storage unit 1120 and the reference signal reception power measured by the power measurement unit 1130.
  • the path loss calculator 1140 may calculate path loss with respect to the reference signal related to the received PDSCH or calculate path loss with respect to the reference signal indicated by the base station.
  • the uplink transmitter 1150 controls the transmission power of the PUCCH and the PUSCH by applying the path loss calculated by the path loss calculator 1140 to Equations 4 to 6.
  • the terminal may control the uplink transmission power for uplink to not only the base station but also other transmission terminals.
  • a UE may receive signals from various transmitters, and a transmitter performing downlink transmission and a transmitter performing uplink reception may not match.
  • the terminal may control the uplink transmission power by using a reference signal transmitted from several transmission terminals and uplink to the transmission terminal designated by the nearest transmission terminal or the base station among the transmission terminals performing downlink transmission. .
  • a transmitting end performing uplink reception is variable.
  • the base station may instruct the terminal to control the uplink transmission power based on the path loss to the transmitting end performing the uplink reception.
  • CSI-RS or DM-RS based uplink power control has been described as an example, but the present invention is not limited thereto.
  • uplink power control based on current or future UE-specific downlink reference signals other than CSI-RS or DM-RS may be performed.
  • CSI-RS or DM-RS based PUCCH or PUSCH power control has been described as an example, but the present invention is not limited thereto.
  • another UE-specific downlink reference signal based SRS power control may be performed.
  • uplink power control has been exemplarily described based on one of UE-specific downlink reference signals, but the present invention is not limited thereto.
  • uplink power control may be performed by combining two or more UE-specific downlink reference signals.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Physical Vapour Deposition (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

La présente invention concerne un système de communication sans fil, et concerne le contrôle de la puissance en liaison montante d'un équipement d'utilisateur dans un système de communication sans fil.
PCT/KR2012/003243 2011-04-26 2012-04-26 Procédé pour la fourniture d'informations de contrôle de la puissance en liaison montante d'une station de base et procédé de contrôle de la puissance en liaison montante d'un équipement d'utilisateur, station de base associée et équipement d'utilisateur associé WO2012148192A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201380075548.6A CN105189808B (zh) 2011-04-26 2013-04-17 薄膜群、薄膜粒子以及制造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020110039200A KR20120121299A (ko) 2011-04-26 2011-04-26 기지국의 상향링크 전력 제어 정보 제공 방법 및 단말의 상향링크 전력 제어 방법, 그 기지국, 그 단말
KR10-2011-0039200 2011-04-26

Publications (2)

Publication Number Publication Date
WO2012148192A2 true WO2012148192A2 (fr) 2012-11-01
WO2012148192A3 WO2012148192A3 (fr) 2013-01-17

Family

ID=47072919

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2012/003243 WO2012148192A2 (fr) 2011-04-26 2012-04-26 Procédé pour la fourniture d'informations de contrôle de la puissance en liaison montante d'une station de base et procédé de contrôle de la puissance en liaison montante d'un équipement d'utilisateur, station de base associée et équipement d'utilisateur associé

Country Status (3)

Country Link
KR (1) KR20120121299A (fr)
CN (1) CN105189808B (fr)
WO (1) WO2012148192A2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9468022B2 (en) * 2012-12-26 2016-10-11 Samsung Electronics Co., Ltd. Method and apparatus for random access in communication system with large number of antennas
KR102084638B1 (ko) 2013-01-11 2020-03-05 삼성전자 주식회사 전송 지점 간 협력을 지원하는 무선 통신 시스템에서 하향링크 데이터 송수신 장치 및 방법
EP2989838B1 (fr) 2013-04-23 2021-01-13 Samsung Electronics Co., Ltd. Procédé et appareil de commande de la puissance d'une liaison montante dans un système de formation de faisceau
WO2017034258A1 (fr) * 2015-08-21 2017-03-02 엘지전자 주식회사 Procédé pour émettre ou recevoir un signal v2x dans un système de communication sans fil et dispositif pour mettre en œuvre ledit procédé
WO2018194352A1 (fr) 2017-04-17 2018-10-25 Samsung Electronics Co., Ltd. Procédé et dispositif de régulation de puissance de liaison montante
KR102210990B1 (ko) * 2017-04-17 2021-02-02 삼성전자 주식회사 업링크 전력 제어를 위한 방법 및 장치
WO2018203728A1 (fr) 2017-05-04 2018-11-08 엘지전자(주) Procédé d'émission et de réception de liaison montante dans un système de communication sans fil, et appareil associé

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100005650A (ko) * 2008-07-07 2010-01-15 엘지전자 주식회사 다중 셀 환경에서 사운딩 채널을 이용한 협력적 ｍｉｍｏ 기법
KR20100121445A (ko) * 2009-05-08 2010-11-17 엘지전자 주식회사 기준 신호에 대한 채널 정보를 전송하는 방법 및 장치
KR20110005362A (ko) * 2009-07-10 2011-01-18 삼성전자주식회사 단말기 및 기지국, 및 단말기의 동작방법

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168986A (en) * 1978-07-03 1979-09-25 Polaroid Corporation Method for preparing lamellar pigments
GB2326420B (en) * 1997-06-20 2001-03-14 Nippon Paint Co Ltd Metallic coating composition and method for forming a multilayer coating
ATE257182T1 (de) * 1998-10-23 2004-01-15 Avery Dennison Corp Verfahren zur herstellung von metallplättchen
US6270841B1 (en) * 1999-07-02 2001-08-07 Sigma Technologies International, Inc. Thin coating manufactured by vapor deposition of solid oligomers
FR2832736B1 (fr) * 2001-11-28 2004-12-10 Eppra Procede perfectionne de revetement d'un support par un materiau

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100005650A (ko) * 2008-07-07 2010-01-15 엘지전자 주식회사 다중 셀 환경에서 사운딩 채널을 이용한 협력적 ｍｉｍｏ 기법
KR20100121445A (ko) * 2009-05-08 2010-11-17 엘지전자 주식회사 기준 신호에 대한 채널 정보를 전송하는 방법 및 장치
KR20110005362A (ko) * 2009-07-10 2011-01-18 삼성전자주식회사 단말기 및 기지국, 및 단말기의 동작방법

Also Published As

Publication number Publication date
WO2012148192A3 (fr) 2013-01-17
KR20120121299A (ko) 2012-11-05
CN105189808A (zh) 2015-12-23
CN105189808B (zh) 2018-03-13

Similar Documents

Publication Publication Date Title
WO2015065087A1 (fr) Appareil et procédé pour annuler un brouillage entre cellules dans un système de communication
WO2016126063A1 (fr) Procédé de signalement d'état de canal dans un système de communication sans fil, et appareil associé
WO2012148192A2 (fr) Procédé pour la fourniture d'informations de contrôle de la puissance en liaison montante d'une station de base et procédé de contrôle de la puissance en liaison montante d'un équipement d'utilisateur, station de base associée et équipement d'utilisateur associé
WO2017222329A1 (fr) Procédé destiné à rapporter un état de canal dans un système de communication sans fil et dispositif associé
WO2018164452A1 (fr) Procédé de réception ou de transmission de signal descendant dans un système de communication sans fil et appareil associé
WO2016144050A1 (fr) Procédé pour émettre un signal dans un système de communication sans fil, et appareil associé
WO2014010841A1 (fr) Commande de puissance d'émission de signal de référence de sondage de liaison montante
WO2016163819A1 (fr) Procédé de déclaration d'état de canal et appareil associé
WO2014069956A1 (fr) Procédé et appareil de réalisation de mesure de brouillage dans un système de communication sans fil
WO2015141959A1 (fr) Procédé et appareil d'émission et de réception d'informations d'état de canal
WO2011014014A2 (fr) Appareil et procédé de coopération multicellulaire dans un système de communication sans fil
WO2016186378A1 (fr) Procédé de renvoi d'informations de signal de référence dans un système de communication sans fil à antennes multiples, et appareil associé
WO2012093759A1 (fr) Procédé et appareil pour sélectionner un nœud dans un système multi-nœuds distribué
WO2016018094A1 (fr) Procédé pour la prise en charge de communication d2d à laquelle est appliquée une technologie mimo et dispositif associé
WO2018012774A1 (fr) Procédé d'émission et de réception dans un système de communication sans fil, et appareil associé
WO2013081368A1 (fr) Procédé et appareil de transmission de signal de référence et de transmission en liaison montante
WO2014123340A1 (fr) Terminal, procédé permettant à un terminal de recevoir des signaux de référence d'informations d'état de canal, station de base et procédé permettant à une station de base de transmettre des signaux de référence d'informations d'état de canal
WO2015009130A1 (fr) Procédé et appareil de communication coopérative dans un système de communication sans fil
WO2014038857A1 (fr) Transmission d'informations de configuration de ressource de mesure de brouillage, et mesure de brouillage
WO2015111966A1 (fr) Système et procédé de transmission d'informations d'état de canal de multiples stations de base lte
WO2018026223A1 (fr) Procédé destiné à un terminal pour le rapport de marge de puissance dans un système de communication sans fil, et terminal mettant en œuvre ce procédé
WO2021246834A1 (fr) Procédé de transmission de srs pour une pluralité de bandes de liaison montante dans un système de communication sans fil, et appareil associé
WO2013048176A1 (fr) Procédé de commande de puissance montante et son procédé de réception de signaux montants
WO2016190549A1 (fr) Procédé et appareil de transmission et réception d'informations de voie dans un système de communication entre véhicules
WO2018062833A1 (fr) Procédé de mesure d'interférence dans un système de communication sans fil et dispositif associé

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12777119

Country of ref document: EP

Kind code of ref document: A2

NENP Non-entry into the national phase in:

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12777119

Country of ref document: EP

Kind code of ref document: A2